PLATE VII 



Described 

 on Page 



Archaeotrigon distagmus Simpson. 52 



Fig. I. Right lower jaw with M2-3, crown view. X 15 diam. Type. Y.P.M. 

 No. 1 364 1. 



Archaeotrigon sp. 



Fig. 2. Isolated right lower molar, internal view. X about 20 diam. 

 Y.P.M. No. 13640. 



Dryolestes friscus Marsh. 58 



Fig. 3. Right lower jaw with P3.4 and Mj.^, internal view. X 9 diam. 

 Parts of jaw with teeth missing are not stereoscopic. (Type of 

 Stylacodon validus.) Y.P.M. No. 11884. 



184 



